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A kind of preparation method of bimetallic PT-BI catalyst and a kind of method of selective catalytic oxidation glycerol to DHA

A catalytic oxidation and catalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, organic compound preparation, catalyst regeneration/reactivation, etc., can solve the problem of reducing glycerin conversion rate and product selectivity, Pt catalyst loss In order to achieve the effect of high DHA selectivity, simple preparation method and high catalytic activity

Active Publication Date: 2020-11-27
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The Pt catalyst can effectively catalyze the oxidation of glycerol into high value-added chemical products, but there will be poisoning, leaching, sintering and other phenomena in the reaction process, which will cause the deactivation of the Pt catalyst and greatly reduce the conversion rate of glycerol and product selectivity.

Method used

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  • A kind of preparation method of bimetallic PT-BI catalyst and a kind of method of selective catalytic oxidation glycerol to DHA
  • A kind of preparation method of bimetallic PT-BI catalyst and a kind of method of selective catalytic oxidation glycerol to DHA

Examples

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Effect test

Embodiment 1

[0055] (1) Catalytic oxidation of glycerol to 1,3-dihydroxyacetone

[0056] In the four-necked flask of 150mL, add aqueous glycerol (50 g, 10wt.%, Bi (m Bi / m Pt = 0.2)) and 100mg of Pt catalyst to form an in-situ bimetallic Pt-Bi catalyst, the temperature was raised to 60°C at a stirring rate of 600 rpm, and then oxygen (150 mL / min) was introduced to start the reaction; after 6h, the reaction was stopped. The mixture of the reaction solution and the catalyst in the reactor must be weighed before and after the reaction, and then the liquid-solid phase mixture is filtered; the reaction liquid is detected and analyzed by liquid chromatography.

[0057] (2) Regeneration of bimetallic Pt-Bi catalyst

[0058] The bimetallic Pt-Bi catalyst reacted in (1) was filtered, washed with water and alcohol, dried in vacuum, ground, put into a porcelain boat, placed in a horizontal high-temperature tube furnace for calcination, and the calcination condition was a temperature of 200 °C, A...

Embodiment 2

[0060] The difference between this example and Example 1 is that the calcination temperature in (2) is 300° C.; the others are the same as Example 1; the obtained catalyst is marked as Pt-Bi(300).

Embodiment 3

[0062] The Pt-Bi(300) prepared in Example 2 was recycled once, that is, steps (1) and (2) were repeated, and the obtained catalyst was marked as Pt-Bi(300-2).

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Abstract

The invention discloses a bimetal Pt-Bi catalyst preparation method which includes the steps: S1 adding Pt catalysts into glycerin reaction liquid containing auxiliaries Bi and performing catalytic oxidation on glycerinated 1, 3-dihydroxy acetone to obtain reaction liquid mixture containing bimetal Pt-Bi catalysts; S2 separating the bimetal Pt-Bi catalysts in the reaction liquid mixture and then performing calcination in inert atmosphere under the condition of 200-300 DEG C to prepare the bimetal Pt-Bi catalysts. According to the preparation method, the inactivated bimetal Pt-Bi catalysts canbe used for preparing the high-activity bimetal Pt-Bi catalysts, the prepared bimetal Pt-Bi catalysts are high in catalytic activity, and glycerinated DHA (docosahexaenoic acid) can be efficiently andselectively catalyzed and oxidized. The bimetal Pt-Bi catalysts are recycled in selective catalytic oxidation of the glycerinated 1, 3-dihydroxy acetone by calcination, the concentration and the Bi content of glycerin in the glycerin reaction liquid are kept constant, and the bimetal Pt-Bi catalysts can keep initial DHA selectivity with high glycerin transformation rate after 2-6 times of cycles.

Description

technical field [0001] The invention relates to the technical field of glycerol liquid-phase oxidation conversion, and more specifically, relates to a preparation method of a bimetallic Pt-Bi catalyst and a method for selectively catalyzing the oxidation of glycerol to prepare DHA. Background technique [0002] Glycerol, as the main by-product in the biodiesel production process, has abundant sources and very low price. Glycerol itself is a highly functional molecule, and its effective utilization can be converted into high value-added fine chemical products, mainly including: glyceraldehyde, 1,3-dihydroxyacetone (DHA), glyceric acid, tartaric acid, etc. Among them, DHA is widely used in the fields of cosmetics, food and pharmaceuticals. [0003] Glycerol has two hydroxyl functional groups, primary and secondary, and its oxidation reaction is also a structure-sensitive reaction, which can be selectively catalyzed and oxidized under certain reaction conditions and catalysts,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/644B01J38/02C07C45/39C07C49/17
CPCB01J23/6447B01J38/02C07C45/39C07C49/17Y02P20/584
Inventor 宁小媚占亮周小松罗金
Owner LINGNAN NORMAL UNIV
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